RFR: 8249825: Tests sun/security/ssl/SSLSocketImpl/SetClientMode.java and NonAutoClose.java marked with @ignore [v2]

[Fernando Guallini]

> The following tests are marked with @ignore (not running):
> 
> - sun/security/ssl/SSLSocketImpl/SetClientMode.java: it checks that setting the clientMode after the handshake has begun is not permitted, but this was failing intermittently due to a race condition, it was possible that SetClientMode was called before the client socket was updated with handshake isNegotiated = true. The fix is to introduce a latch to sync between client and main threads. Included additional refactoring to ensure test stability.
> 
> - sun/security/ssl/SSLSocketImpl/NonAutoClose.java: This test should only run in TLS <= 1.2, as TLSv1.3 changes the behaviour of close_notify. Included additional refactoring to ensure test stability.
> 
> Executed both tests 10K times, no test flakiness found

Fernando Guallini has updated the pull request incrementally with one additional commit since the last revision:

  SSLContextTemplate and using asserts

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/23898/files
  - new: https://git.openjdk.org/jdk/pull/23898/files/837ddd1b..b6ac1491

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23898&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23898&range=00-01

  Stats: 63 lines in 2 files changed: 0 ins; 47 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/23898.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23898/head:pull/23898

PR: https://git.openjdk.org/jdk/pull/23898